1. GEE AT BLACK-BACKED GULL, L. MARINTJS. 



Fig. 48. 



Large, 28.00-31.00; 

 mantle, dark slate, 

 appearing black in 

 the distance; prima- 

 ries, with white tips 

 and spots near ends, 

 fig. 48. Young rath- 

 ^ er pale brownish, 

 - darkest above, and 



I vy; :; streaked with buff 

 ^ ' ^// and grayish. Downy 



ttljj^ y un >g ra y ish - 



^&^v white, mottled above 

 ^r ^"Ji'.ic^^- w ith dusky; top of 

 B, C 9 1. 1-10. head, spotted with 



black. Breeds from the Bay of Fundy northward in May on 

 coasts and islands of the North Atlantic ; migrates south- 

 ward in Sept. ; winters from Southern Greenland, as far south 

 as L. I. ; goes north the last of April ; occasionally a few will 

 remain as far south as Cape Ann, Mass, in summer; common. 



2. SIBERIAN GULL, L. AFFINIS. Smaller than 1 ; 20.00; 

 mantle a little paler and the feet are yellow. Northern 

 Asia; accidental in Southern Greenland. 



3. GLAUCOUS GULL, L. GLATJCUS. About the size of 

 1 ; mantle and wings, pale pearl-gray. Young, grayish-white ; 

 brownish-gray below ; upper parts, transversely mottled with 

 pale brownish. Downy young, grayish-white, paler beneath 

 mottled and clouded above with dusky and grayish. Breeds 

 in the Arctic regions, where it is common ; south in winter 

 regularly to the Gulf of St. Lawrence, and rarely to the Great 

 Lakes and L. I. 



4. HERRING GULL, L. ARGENTATUS. 24.00; white; 

 mantle, pearl-gray ; primaries, with white tips and spots near 

 ends, that on outer feather, usually extending to the tip with- 

 out being interrupted by a black cross bar, fig. 50 ; bill, yellow ; 



